A B C D NOTE: UNLESS OTHERWISE SPECIFIED ECO 1. ALL RESISTORS ARE IN OHMS 0402 REV VIN VIN SHDN / UVLO R14 (Opt.) C1 1uF 50V 0805 OUT E6 R13 (Opt.) 0603 E7 R4 1M 1206 15 R15 (Opt.) 0603 E8 PVIN R6 1M CTRL E11 3 14 OUT R12 (Opt.) 0603 U1 VIN CATHODE ISP ISN 4 R5 PWM 5 R1 1.69 0805 10 VREF OPENLED 12 R17 (Opt.) 0603 13 2 CTRL R11 (Opt.) 0603 3 R3 69.8k VIN R10 100k 0603 GND 1 LED+ 16V MAX 150mA R16 (Opt.) 0603 OUT 3 Q1 (Opt.) SOT23 E9 E10 OPENLED LED- M1 Si2318DS 2 ASSEMBLY TABLE: E3 ASSY *PVIN, VIN U1 L1, L2 C3 R5 -A 6V - 24V LT3519EMS-1 22uH 2.2uF, 1206 261k -B 7V - 24V LT3519EMS-2 10uH 1uF, 0805 251k CUSTOMER NOTICE CONTRACT NO. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. APPROVALS PCB DES. ENG. B R9 0 0805 TECHNOLOGY K.L. KEITH S. E13 GND 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC 1 HIGH FREQUENCY SEPIC LED DRIVER SIZE IC NO. LT3519EMS-1 / -2 DEMO CIRCUIT 1612A-A / B N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A 2 1 R7 174k 2 OUT PVIN R2 1M FB 4 E1 E4 11 SHDN/UVLO PWM 11-23-09 2 3 R8 0 1206 E5 *6V - 24V GND OUT C5 (Opt.) 1206 1 (Opt.) 6032 C4 2.2uF 25V 1206 3 E12 KEITH S. 1 8 9 16 GND C2 1uF 50V 0805 6 +C6 *6V - 24V ANODE E2 DATE OUT L2 C3 SW PVIN L1 7 PVIN APPROVED PRODUCTION GND GND GND GND * SEE QUICKSTART GUIDE FOR MIN. INPUT DESCRIPTION 1 - 4 E REVISION HISTORY DATE: C Thursday, January 14, 2010 D SHEET E REV 1 1 OF 1